A user of microblogging service Weibo posted a set of pictures showing a bizarre "cloud wall" moving around at Changshui airport in Kunming, capital of southwest China's Yunnan province, on Feb. 18, 2014. The scene lasted about half an hour; however, the cloud wall didn't cause any trouble for the airport. Meteorologists explained that the formation came about when the south wind encountered a strong cold front in a confined space to create heavy fog resembling a wall. [Photo: Xinhua]

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